Your Opinions Please

We dont use (bondo) never ever! Use a lightweight body filler. Different fillers can make a difference in time, some sand faster than others and some clog up your sandpaper faster.
I like 3M light weight body filler part #05801 Sand that with 36 or 40 grit then switch to 80 grit. After this i apply a skim coat of evercoat metal glaze OEM - block this with 80 grit then 150 grit then 320 grit then prime with a 2k primer. If you dont sand your body work down to at least 320 grit you will probably see sand scratches after the car is painted because the primer will eventually shrink into those scratches.
I have been buying my supplies from autobodytoolmart.com
They are much cheaper than the auto parts stores and ship very fast.